Tip for hydrometer syringes



Jul 24, 1928.

M. S. LOWER TIP FOR HYDROMETERSYRINGES fizz/672M," MM 13 Filed Nov. 8,1926 Wm th Passed Jul 24, 1928.

mm e no; or smnni'ou, omo, AssIerroa r 3 I conromrron or 0310.

sun norm comm, a

runma mnonn'rnn mm.

Application fled Ill'ovember 8," 1928. Serial in. 147,175.

of hydrometer syringe that has but been in coon use is that in which therubber tip has at one end a stopperlike p that fits intothe glass jar ofthe 5 device. elug must of course, fit tightly to prevent leahage astthesame and to prevent the tip from flopping ofl. While this of is inother ways an excellent one, 13h has always been experienced in Wsecuring a plu that may be applied readily to the jar] thereafter remainin place. The plug is usually tapered rather sharply toward a, riborhange" extending around the same at'the' juncture of the same with espout, so that the compression of the plug mot proggessively from thesmallor end toward the ase as the plug is forced into the jar. Jars ofthe same End vary somewhat in diameter and it is therefore i impossibleso to desi theplug that the rib or r q thereon 'w' always abut a ainstthe I? of the jar when the plug is orced into thelatter. The result isthat, even though the lug is pushed in with consider M able force, theurge end of the plug usually projects beyond the end of the jar,producmg anabrupt bilge, as it were, in the plug. At the juncture thebulge with the compressed portion in the jar the rubber is 0 undercompression in the directionof the le h of the plug and therefore tendsto p the plug out.

The ob ect of the present invention is to produce a plu for a tip ornozzle or the Wlll be overcome and which may easil applied to a barrelor tube and fit snugly into and be securely held in thelaifler. v

40 carrymg' the plug that all occurs while the rib or flan e is still atsome distance 'from the end of t plug is forced into the latter.

this is much 1cm than the resistance encountered while compression istaking place, the

the movement of the plug is or snap which brings the rib. or flaggggintocontact with the end of the the claim; but, for a a fragment isshown; Fi

likeinwhichteobjectionstothe 0ld,typ h (12 B dth h (I ,a ea -eyon ,e eais out my invention I so shape' radial compression thereof e jar whenthe.

Thereafter d1 5 there is only frictional resistance to further. inwardmovement of the plug and, because;

to force it out andit remainssecurely attached tothe 1 jar. 'I attainthis improved result by form-- mg a groove around the base of the plug,adjacent to the rib or flange, or, viewed in another way, by reducingthe size of the plug at the-base to form a neck. -Thus, when the plug ispushed into a jar, its entire efi'ective length is compressed and then aportion smaller in diameter than the interior of the barrel enters thebarrel, no further compression resulting.

Not'only does the presence of a neck at the inner -end ofthe plug doaway with objectionable internal stresses in the plug when attached to ajar, but I have found that the excessive taper heretofore employed in anendeavor to make the plug stick is unnecessary; and therefore lesseffort is required to force the plug into the jar.

e various features of novelty whereby my invention is characterized willhereinafter be pointed out with particularity in full understanding ofmy invention and of tages, reference may be had to the followingdetailed description taken in connection with the accompanying drawing,wherein:

Figure 1 is an elevation of my improved tip attached to a jar or tube ofwhich only 2 is a longitudinal axial section throug the arts shown inFig. 1; and Fig. 3 is a side e evation and its objects and advan- Fig.4a plan view of the tip removed from slightly-smaller in diameter at itsfree end than at the base; the largest diameter of the plug being. muchless than that of; the head,

whereby the head forms a rib or flange around the plug]. Thebase of theplug is spaced ap'arta s ort distance from the head, being'connectedthereto by a neck 4 whose 'ameteris preferably less than the smallestdiameter of the plug or, at least, smaller than the internal diameterofthe jar or'the like with which the plug is to be associated.01.3,,if'the entire part of the'tip beyond the head is referred to asthe plug, the plug may be said to have a groove extending around thesame at the juncture of the plug with the rib or fi'augeconstituted bythe marginal P r i of. e hea The plugis fitted'into the a plug 3' en d"of a jar or '5 I tube, such as shown at A in Figs. 1 and 2, the rib orflange abuttin against the extreme end of the jar. As estshown in Fig.2, the short neck at the base of the plug is not in contact with thesurrounding jar and is not subject to radial compression. Therefore,after the plug proper has passed into the jar, the resistance that hadbeen encountered because of the need to decrease the diameter ofthe'plug to allow it to enter the jar suddenly ceases and the tip jumpsforward until brought to rest through the engagement of the flange orrib with the end of the jar.

When the parts are assembled, as shown in Figs. 1 and 2, the reactingforces between the plug and the jar are all radial, there being none inthe longitudinal direction. Consequently the grip of the jar upon theplug is all utilized to support the weight of the tip and any loadthatthe tip may be carrying, no part thereof being required tocounteract'internal stresses in the tip. A grooved plug need thereforehave only a slight taper to insure the permanency of its connection withthe jar.

While I have illustrated and .described with particularity only a singlepreferred form of my invention, I do not desire to be limited to theexact structural details thus illustrated and described; but intend tocover all forms and arrangements which come within the definitions of myinvention constituting the appended claim.

. I claim:

A rubber tip adapted to be attachedto the end of a tubular member,comprising an element having at one end a tapered plug to be forced intosaid member and an enlargement 'inwardl of said lug to abut against theend 0 said mem er when the plug is inserted in the same, and there beingbetween the plug and said enlargement a. short section of smallerdiameter than the interior of said tube. I

In testimony whereof, I sign this specification.

MELVIN S. LOWER.

